The riots started because some hard man kid attacked a police officer, the policeman fired rubber bullets at him, which killed him.
Then his parents went on a protest to ask for a formal apology from the metro police. Then all of his friends, and their friends, and their friends took it upon themselves to fight the power, and start a riot. They set buildings on fire and looted as much as they could. Which also inspired others of there... type, to follow their example. After all, if they're looting free stuff, we shouldn't they?
Right now, being is London is the scariest thing I've ever done. Especially when it starts to get dark. At the moment the sun is on its way down, and I've been fearing for my life for 4 days now. At any moment the house could get smashed, broken into, or burned down. Stuff has already been stolen from my garage, its not that expensive, but the fact that they've already been in and done this sort of stuff scares me to death.